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Merge branch 'for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
[linux-2.6-block.git] / net / mac80211 / wpa.c
CommitLineData
f0706e82
JB		 1/*
2 * Copyright 2002-2004, Instant802 Networks, Inc.
765cb46a 3 * Copyright 2008, Jouni Malinen <j@w1.fi>
f0706e82
JB		 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/netdevice.h>
11#include <linux/types.h>
f0706e82
JB		 12#include <linux/skbuff.h>
13#include <linux/compiler.h>
f14df804 14#include <linux/ieee80211.h>
5a0e3ad6 15#include <linux/gfp.h>
f14df804 16#include <asm/unaligned.h>
f0706e82 17#include <net/mac80211.h>
aba83a0b 18#include <crypto/aes.h>
eb063c17 19
f0706e82
JB		 20#include "ieee80211_i.h"
21#include "michael.h"
22#include "tkip.h"
23#include "aes_ccm.h"
765cb46a 24#include "aes_cmac.h"
8ade538b 25#include "aes_gmac.h"
00b9cfa3 26#include "aes_gcm.h"
f0706e82
JB		 27#include "wpa.h"
28
9ae54c84 29ieee80211_tx_result
5cf121c3 30ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
f0706e82 31{
747d753d 32 u8 *data, *key, *mic;
f0706e82 33 size_t data_len;
8e8862b7
HH		 34 unsigned int hdrlen;
35 struct ieee80211_hdr *hdr;
f0706e82 36 struct sk_buff *skb = tx->skb;
813d7669 37 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a 38 int tail;
f0706e82 39
c34498b9 40 hdr = (struct ieee80211_hdr *)skb->data;
97359d12
JB		 41 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
42 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
9ae54c84 43 return TX_CONTINUE;
f0706e82 44
8e8862b7
HH		 45 hdrlen = ieee80211_hdrlen(hdr->frame_control);
46 if (skb->len < hdrlen)
9ae54c84 47 return TX_DROP;
f0706e82 48
8e8862b7
HH		 49 data = skb->data + hdrlen;
50 data_len = skb->len - hdrlen;
51
681d1190
JM		 52 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
53 /* Need to use software crypto for the test */
54 info->control.hw_key = NULL;
55 }
56
813d7669 57 if (info->control.hw_key &&
a26eb27a
JB		 58 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
59 tx->local->ops->set_frag_threshold) &&
813d7669
JB		 60 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
61 /* hwaccel - with no need for SW-generated MMIC */
9ae54c84 62 return TX_CONTINUE;
f0706e82
JB		 63 }
64
23c0752a 65 tail = MICHAEL_MIC_LEN;
813d7669 66 if (!info->control.hw_key)
4325f6ca 67 tail += IEEE80211_TKIP_ICV_LEN;
23c0752a 68
b1e9be87
JB		 69 if (WARN(skb_tailroom(skb) < tail ||
70 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
71 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
72 skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
73 skb_tailroom(skb), tail))
23c0752a 74 return TX_DROP;
f0706e82 75
747d753d 76 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
f0706e82 77 mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7 78 michael_mic(key, hdr, data, data_len, mic);
681d1190
JM		 79 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
80 mic[0]++;
f0706e82 81
9ae54c84 82 return TX_CONTINUE;
f0706e82
JB		 83}
84
85
9ae54c84 86ieee80211_rx_result
5cf121c3 87ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82 88{
747d753d 89 u8 *data, *key = NULL;
f0706e82 90 size_t data_len;
8e8862b7 91 unsigned int hdrlen;
f0706e82
JB		 92 u8 mic[MICHAEL_MIC_LEN];
93 struct sk_buff *skb = rx->skb;
eb9fb5b8
JB		 94 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
95 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
f0706e82 96
816c04fe
CL		 97 /*
98 * it makes no sense to check for MIC errors on anything other
99 * than data frames.
100 */
101 if (!ieee80211_is_data_present(hdr->frame_control))
9ae54c84 102 return RX_CONTINUE;
f0706e82 103
816c04fe
CL		 104 /*
105 * No way to verify the MIC if the hardware stripped it or
106 * the IV with the key index. In this case we have solely rely
107 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
108 * MIC failure report.
109 */
110 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
111 if (status->flag & RX_FLAG_MMIC_ERROR)
b98ea058 112 goto mic_fail_no_key;
816c04fe 113
4045f72b
SG		 114 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
115 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
816c04fe
CL		 116 goto update_iv;
117
118 return RX_CONTINUE;
119 }
120
121 /*
122 * Some hardware seems to generate Michael MIC failure reports; even
123 * though, the frame was not encrypted with TKIP and therefore has no
124 * MIC. Ignore the flag them to avoid triggering countermeasures.
125 */
97359d12 126 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
816c04fe 127 !(status->flag & RX_FLAG_DECRYPTED))
9ae54c84 128 return RX_CONTINUE;
f0706e82 129
816c04fe
CL		 130 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
131 /*
132 * APs with pairwise keys should never receive Michael MIC
133 * errors for non-zero keyidx because these are reserved for
134 * group keys and only the AP is sending real multicast
87ee475e 135 * frames in the BSS.
816c04fe
CL		 136 */
137 return RX_DROP_UNUSABLE;
138 }
139
140 if (status->flag & RX_FLAG_MMIC_ERROR)
141 goto mic_fail;
142
8e8862b7
HH		 143 hdrlen = ieee80211_hdrlen(hdr->frame_control);
144 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add 145 return RX_DROP_UNUSABLE;
f0706e82 146
a8286911
JB		 147 if (skb_linearize(rx->skb))
148 return RX_DROP_UNUSABLE;
149 hdr = (void *)skb->data;
150
8e8862b7
HH		 151 data = skb->data + hdrlen;
152 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
747d753d 153 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
8e8862b7 154 michael_mic(key, hdr, data, data_len, mic);
816c04fe
CL		 155 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
156 goto mic_fail;
f0706e82 157
f0706e82
JB		 158 /* remove Michael MIC from payload */
159 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
160
816c04fe 161update_iv:
50741ae0 162 /* update IV in key information to be able to detect replays */
9e26297a
JB		 163 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
164 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;
50741ae0 165
9ae54c84 166 return RX_CONTINUE;
816c04fe
CL		 167
168mic_fail:
b98ea058
S		 169 rx->key->u.tkip.mic_failures++;
170
171mic_fail_no_key:
a66b98db
AN		 172 /*
173 * In some cases the key can be unset - e.g. a multicast packet, in
174 * a driver that supports HW encryption. Send up the key idx only if
175 * the key is set.
176 */
6f1f5d5f
JB		 177 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
178 is_multicast_ether_addr(hdr->addr1) ?
179 NL80211_KEYTYPE_GROUP :
180 NL80211_KEYTYPE_PAIRWISE,
181 rx->key ? rx->key->conf.keyidx : -1,
182 NULL, GFP_ATOMIC);
816c04fe 183 return RX_DROP_UNUSABLE;
f0706e82
JB		 184}
185
186
e039fa4a 187static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
f0706e82
JB		 188{
189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
190 struct ieee80211_key *key = tx->key;
e039fa4a 191 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac
HH		 192 unsigned int hdrlen;
193 int len, tail;
f0706e82
JB		 194 u8 *pos;
195
813d7669 196 if (info->control.hw_key &&
ee70108f
JD		 197 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
198 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
813d7669 199 /* hwaccel - with no need for software-generated IV */
23c0752a 200 return 0;
e039fa4a
JB		 201 }
202
d5184cac 203 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82
JB		 204 len = skb->len - hdrlen;
205
813d7669 206 if (info->control.hw_key)
23c0752a 207 tail = 0;
11a843b7 208 else
4325f6ca 209 tail = IEEE80211_TKIP_ICV_LEN;
23c0752a
JB		 210
211 if (WARN_ON(skb_tailroom(skb) < tail ||
4325f6ca 212 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
23c0752a 213 return -1;
f0706e82 214
4325f6ca
JB		 215 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
216 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
f0706e82
JB		 217 pos += hdrlen;
218
ee70108f
JD		 219 /* the HW only needs room for the IV, but not the actual IV */
220 if (info->control.hw_key &&
221 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
222 return 0;
223
f0706e82 224 /* Increase IV for the frame */
03395003 225 spin_lock(&key->u.tkip.txlock);
b0f76b33
HH		 226 key->u.tkip.tx.iv16++;
227 if (key->u.tkip.tx.iv16 == 0)
228 key->u.tkip.tx.iv32++;
523b02ea 229 pos = ieee80211_tkip_add_iv(pos, key);
03395003 230 spin_unlock(&key->u.tkip.txlock);
f0706e82 231
813d7669
JB		 232 /* hwaccel - with software IV */
233 if (info->control.hw_key)
f0706e82 234 return 0;
f0706e82
JB		 235
236 /* Add room for ICV */
4325f6ca 237 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
f0706e82 238
3473187d 239 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
523b02ea 240 key, skb, pos, len);
f0706e82
JB		 241}
242
243
9ae54c84 244ieee80211_tx_result
5cf121c3 245ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82 246{
252b86c4 247 struct sk_buff *skb;
f0706e82 248
5cf121c3 249 ieee80211_tx_set_protected(tx);
f0706e82 250
252b86c4 251 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9
JB		 252 if (tkip_encrypt_skb(tx, skb) < 0)
253 return TX_DROP;
252b86c4 254 }
f0706e82 255
9ae54c84 256 return TX_CONTINUE;
f0706e82
JB		 257}
258
259
9ae54c84 260ieee80211_rx_result
5cf121c3 261ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82
JB		 262{
263 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
747d753d 264 int hdrlen, res, hwaccel = 0;
f0706e82
JB		 265 struct ieee80211_key *key = rx->key;
266 struct sk_buff *skb = rx->skb;
eb9fb5b8 267 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
f0706e82 268
d5184cac 269 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 270
c34498b9 271 if (!ieee80211_is_data(hdr->frame_control))
9ae54c84 272 return RX_CONTINUE;
f0706e82
JB		 273
274 if (!rx->sta || skb->len - hdrlen < 12)
e4c26add 275 return RX_DROP_UNUSABLE;
f0706e82 276
a8286911
JB		 277 /* it may be possible to optimize this a bit more */
278 if (skb_linearize(rx->skb))
279 return RX_DROP_UNUSABLE;
280 hdr = (void *)skb->data;
281
dc1580dd
JB		 282 /*
283 * Let TKIP code verify IV, but skip decryption.
284 * In the case where hardware checks the IV as well,
285 * we don't even get here, see ieee80211_rx_h_decrypt()
286 */
287 if (status->flag & RX_FLAG_DECRYPTED)
f0706e82 288 hwaccel = 1;
f0706e82
JB		 289
290 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
291 key, skb->data + hdrlen,
17741cdc 292 skb->len - hdrlen, rx->sta->sta.addr,
9e26297a 293 hdr->addr1, hwaccel, rx->security_idx,
5cf121c3
JB		 294 &rx->tkip_iv32,
295 &rx->tkip_iv16);
747d753d 296 if (res != TKIP_DECRYPT_OK)
e4c26add 297 return RX_DROP_UNUSABLE;
f0706e82
JB		 298
299 /* Trim ICV */
4325f6ca 300 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
f0706e82
JB		 301
302 /* Remove IV */
4325f6ca
JB		 303 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
304 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
f0706e82 305
9ae54c84 306 return RX_CONTINUE;
f0706e82
JB		 307}
308
309
30ef7ef9 310static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
f0706e82 311{
f14df804 312 __le16 mask_fc;
fb733336 313 int a4_included, mgmt;
f14df804 314 u8 qos_tid;
7ec7c4a9 315 u16 len_a;
f14df804
HH		 316 unsigned int hdrlen;
317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
f0706e82 318
f14df804 319 /*
fb733336 320 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
f14df804
HH		 321 * Retry, PwrMgt, MoreData; set Protected
322 */
fb733336 323 mgmt = ieee80211_is_mgmt(hdr->frame_control);
f14df804 324 mask_fc = hdr->frame_control;
fb733336 325 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
f14df804 326 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
fb733336
JM		 327 if (!mgmt)
328 mask_fc &= ~cpu_to_le16(0x0070);
f14df804
HH		 329 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
330
331 hdrlen = ieee80211_hdrlen(hdr->frame_control);
332 len_a = hdrlen - 2;
333 a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82 334
f14df804
HH		 335 if (ieee80211_is_data_qos(hdr->frame_control))
336 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
337 else
338 qos_tid = 0;
339
7ec7c4a9
AB		 340 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
341 * mode authentication are not allowed to collide, yet both are derived
342 * from this vector b_0. We only set L := 1 here to indicate that the
343 * data size can be represented in (L+1) bytes. The CCM layer will take
344 * care of storing the data length in the top (L+1) bytes and setting
345 * and clearing the other bits as is required to derive the two IVs.
346 */
347 b_0[0] = 0x1;
f14df804 348
fb733336
JM		 349 /* Nonce: Nonce Flags | A2 | PN
350 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
351 */
352 b_0[1] = qos_tid | (mgmt << 4);
73e1f7c8 353 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
4325f6ca 354 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
f0706e82
JB		 355
356 /* AAD (extra authenticate-only data) / masked 802.11 header
357 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
f14df804
HH		 358 put_unaligned_be16(len_a, &aad[0]);
359 put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8 360 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82
JB		 361
362 /* Mask Seq#, leave Frag# */
363 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
364 aad[23] = 0;
f14df804 365
f0706e82 366 if (a4_included) {
73e1f7c8 367 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804 368 aad[30] = qos_tid;
f0706e82 369 aad[31] = 0;
f14df804 370 } else {
73e1f7c8 371 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804 372 aad[24] = qos_tid;
f0706e82
JB		 373 }
374}
375
376
377static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
378{
379 hdr[0] = pn[5];
380 hdr[1] = pn[4];
381 hdr[2] = 0;
382 hdr[3] = 0x20 | (key_id << 6);
383 hdr[4] = pn[3];
384 hdr[5] = pn[2];
385 hdr[6] = pn[1];
386 hdr[7] = pn[0];
387}
388
389
c6a1fa12 390static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
f0706e82
JB		 391{
392 pn[0] = hdr[7];
393 pn[1] = hdr[6];
394 pn[2] = hdr[5];
395 pn[3] = hdr[4];
396 pn[4] = hdr[1];
397 pn[5] = hdr[0];
f0706e82
JB		 398}
399
400
2b2ba0db
JM		 401static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
402 unsigned int mic_len)
f0706e82
JB		 403{
404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
405 struct ieee80211_key *key = tx->key;
e039fa4a 406 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a 407 int hdrlen, len, tail;
aba83a0b
JB		 408 u8 *pos;
409 u8 pn[6];
410 u64 pn64;
7ec7c4a9
AB		 411 u8 aad[2 * AES_BLOCK_SIZE];
412 u8 b_0[AES_BLOCK_SIZE];
f0706e82 413
813d7669 414 if (info->control.hw_key &&
077a9154 415 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
17d38fa8
MK		 416 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
417 !((info->control.hw_key->flags &
418 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
419 ieee80211_is_mgmt(hdr->frame_control))) {
813d7669
JB		 420 /*
421 * hwaccel has no need for preallocated room for CCMP
422 * header or MIC fields
423 */
23c0752a 424 return 0;
e039fa4a
JB		 425 }
426
d5184cac 427 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82
JB		 428 len = skb->len - hdrlen;
429
813d7669 430 if (info->control.hw_key)
23c0752a 431 tail = 0;
11a843b7 432 else
2b2ba0db 433 tail = mic_len;
23c0752a
JB		 434
435 if (WARN_ON(skb_tailroom(skb) < tail ||
4325f6ca 436 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
23c0752a 437 return -1;
f0706e82 438
4325f6ca
JB		 439 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
440 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
077a9154
AN		 441
442 /* the HW only needs room for the IV, but not the actual IV */
e0830f71
AN		 443 if (info->control.hw_key &&
444 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
077a9154
AN		 445 return 0;
446
f0706e82
JB		 447 hdr = (struct ieee80211_hdr *) pos;
448 pos += hdrlen;
449
db388a56 450 pn64 = atomic64_inc_return(&key->conf.tx_pn);
f0706e82 451
aba83a0b
JB		 452 pn[5] = pn64;
453 pn[4] = pn64 >> 8;
454 pn[3] = pn64 >> 16;
455 pn[2] = pn64 >> 24;
456 pn[1] = pn64 >> 32;
457 pn[0] = pn64 >> 40;
f0706e82 458
8f20fc24 459 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82 460
813d7669
JB		 461 /* hwaccel - with software CCMP header */
462 if (info->control.hw_key)
f0706e82 463 return 0;
f0706e82 464
4325f6ca 465 pos += IEEE80211_CCMP_HDR_LEN;
30ef7ef9 466 ccmp_special_blocks(skb, pn, b_0, aad);
7ec7c4a9 467 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
2b2ba0db 468 skb_put(skb, mic_len), mic_len);
f0706e82
JB		 469
470 return 0;
471}
472
473
9ae54c84 474ieee80211_tx_result
2b2ba0db
JM		 475ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
476 unsigned int mic_len)
f0706e82 477{
252b86c4 478 struct sk_buff *skb;
f0706e82 479
5cf121c3 480 ieee80211_tx_set_protected(tx);
f0706e82 481
252b86c4 482 skb_queue_walk(&tx->skbs, skb) {
2b2ba0db 483 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
2de8e0d9 484 return TX_DROP;
252b86c4 485 }
f0706e82 486
9ae54c84 487 return TX_CONTINUE;
f0706e82
JB		 488}
489
490
9ae54c84 491ieee80211_rx_result
2b2ba0db
JM		 492ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
493 unsigned int mic_len)
f0706e82 494{
c34498b9 495 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
f0706e82
JB		 496 int hdrlen;
497 struct ieee80211_key *key = rx->key;
498 struct sk_buff *skb = rx->skb;
eb9fb5b8 499 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4325f6ca 500 u8 pn[IEEE80211_CCMP_PN_LEN];
f0706e82 501 int data_len;
9190252c 502 int queue;
f0706e82 503
d5184cac 504 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 505
fb733336 506 if (!ieee80211_is_data(hdr->frame_control) &&
d8ca16db 507 !ieee80211_is_robust_mgmt_frame(skb))
9ae54c84 508 return RX_CONTINUE;
f0706e82 509
2b2ba0db 510 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
f0706e82 511 if (!rx->sta || data_len < 0)
e4c26add 512 return RX_DROP_UNUSABLE;
f0706e82 513
a8286911 514 if (status->flag & RX_FLAG_DECRYPTED) {
4325f6ca 515 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
a8286911
JB		 516 return RX_DROP_UNUSABLE;
517 } else {
518 if (skb_linearize(rx->skb))
519 return RX_DROP_UNUSABLE;
520 }
521
981d94a8
JB		 522 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
523 ccmp_hdr2pn(pn, skb->data + hdrlen);
f0706e82 524
981d94a8 525 queue = rx->security_idx;
9190252c 526
981d94a8
JB		 527 if (memcmp(pn, key->u.ccmp.rx_pn[queue],
528 IEEE80211_CCMP_PN_LEN) <= 0) {
529 key->u.ccmp.replays++;
e4c26add 530 return RX_DROP_UNUSABLE;
981d94a8
JB		 531 }
532
533 if (!(status->flag & RX_FLAG_DECRYPTED)) {
534 u8 aad[2 * AES_BLOCK_SIZE];
535 u8 b_0[AES_BLOCK_SIZE];
536 /* hardware didn't decrypt/verify MIC */
537 ccmp_special_blocks(skb, pn, b_0, aad);
538
539 if (ieee80211_aes_ccm_decrypt(
540 key->u.ccmp.tfm, b_0, aad,
541 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
542 data_len,
543 skb->data + skb->len - mic_len, mic_len))
544 return RX_DROP_UNUSABLE;
545 }
546
547 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
f0706e82
JB		 548 }
549
f0706e82 550 /* Remove CCMP header and MIC */
2b2ba0db 551 if (pskb_trim(skb, skb->len - mic_len))
a8286911 552 return RX_DROP_UNUSABLE;
4325f6ca
JB		 553 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
554 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
f0706e82 555
9ae54c84 556 return RX_CONTINUE;
f0706e82 557}
765cb46a 558
00b9cfa3
JM		 559static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
560{
561 __le16 mask_fc;
562 u8 qos_tid;
563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
564
565 memcpy(j_0, hdr->addr2, ETH_ALEN);
566 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
567 j_0[13] = 0;
568 j_0[14] = 0;
569 j_0[AES_BLOCK_SIZE - 1] = 0x01;
570
571 /* AAD (extra authenticate-only data) / masked 802.11 header
572 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
573 */
574 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
575 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
576 * Retry, PwrMgt, MoreData; set Protected
577 */
578 mask_fc = hdr->frame_control;
579 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
580 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
581 if (!ieee80211_is_mgmt(hdr->frame_control))
582 mask_fc &= ~cpu_to_le16(0x0070);
583 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
584
585 put_unaligned(mask_fc, (__le16 *)&aad[2]);
586 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
587
588 /* Mask Seq#, leave Frag# */
589 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
590 aad[23] = 0;
591
592 if (ieee80211_is_data_qos(hdr->frame_control))
593 qos_tid = *ieee80211_get_qos_ctl(hdr) &
594 IEEE80211_QOS_CTL_TID_MASK;
595 else
596 qos_tid = 0;
597
598 if (ieee80211_has_a4(hdr->frame_control)) {
599 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
600 aad[30] = qos_tid;
601 aad[31] = 0;
602 } else {
603 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
604 aad[24] = qos_tid;
605 }
606}
607
608static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
609{
610 hdr[0] = pn[5];
611 hdr[1] = pn[4];
612 hdr[2] = 0;
613 hdr[3] = 0x20 | (key_id << 6);
614 hdr[4] = pn[3];
615 hdr[5] = pn[2];
616 hdr[6] = pn[1];
617 hdr[7] = pn[0];
618}
619
620static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
621{
622 pn[0] = hdr[7];
623 pn[1] = hdr[6];
624 pn[2] = hdr[5];
625 pn[3] = hdr[4];
626 pn[4] = hdr[1];
627 pn[5] = hdr[0];
628}
629
630static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
631{
632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
633 struct ieee80211_key *key = tx->key;
634 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
635 int hdrlen, len, tail;
636 u8 *pos;
637 u8 pn[6];
638 u64 pn64;
639 u8 aad[2 * AES_BLOCK_SIZE];
640 u8 j_0[AES_BLOCK_SIZE];
641
642 if (info->control.hw_key &&
643 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
644 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
645 !((info->control.hw_key->flags &
646 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
647 ieee80211_is_mgmt(hdr->frame_control))) {
648 /* hwaccel has no need for preallocated room for GCMP
649 * header or MIC fields
650 */
651 return 0;
652 }
653
654 hdrlen = ieee80211_hdrlen(hdr->frame_control);
655 len = skb->len - hdrlen;
656
657 if (info->control.hw_key)
658 tail = 0;
659 else
660 tail = IEEE80211_GCMP_MIC_LEN;
661
662 if (WARN_ON(skb_tailroom(skb) < tail ||
663 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
664 return -1;
665
666 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
667 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
668 skb_set_network_header(skb, skb_network_offset(skb) +
669 IEEE80211_GCMP_HDR_LEN);
670
671 /* the HW only needs room for the IV, but not the actual IV */
672 if (info->control.hw_key &&
673 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
674 return 0;
675
676 hdr = (struct ieee80211_hdr *)pos;
677 pos += hdrlen;
678
db388a56 679 pn64 = atomic64_inc_return(&key->conf.tx_pn);
00b9cfa3
JM		 680
681 pn[5] = pn64;
682 pn[4] = pn64 >> 8;
683 pn[3] = pn64 >> 16;
684 pn[2] = pn64 >> 24;
685 pn[1] = pn64 >> 32;
686 pn[0] = pn64 >> 40;
687
688 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
689
690 /* hwaccel - with software GCMP header */
691 if (info->control.hw_key)
692 return 0;
693
694 pos += IEEE80211_GCMP_HDR_LEN;
695 gcmp_special_blocks(skb, pn, j_0, aad);
696 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
697 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
698
699 return 0;
700}
701
702ieee80211_tx_result
703ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
704{
705 struct sk_buff *skb;
706
707 ieee80211_tx_set_protected(tx);
708
709 skb_queue_walk(&tx->skbs, skb) {
710 if (gcmp_encrypt_skb(tx, skb) < 0)
711 return TX_DROP;
712 }
713
714 return TX_CONTINUE;
715}
716
717ieee80211_rx_result
718ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
719{
720 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
721 int hdrlen;
722 struct ieee80211_key *key = rx->key;
723 struct sk_buff *skb = rx->skb;
724 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
725 u8 pn[IEEE80211_GCMP_PN_LEN];
726 int data_len;
727 int queue;
728
729 hdrlen = ieee80211_hdrlen(hdr->frame_control);
730
731 if (!ieee80211_is_data(hdr->frame_control) &&
732 !ieee80211_is_robust_mgmt_frame(skb))
733 return RX_CONTINUE;
734
735 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN -
736 IEEE80211_GCMP_MIC_LEN;
737 if (!rx->sta || data_len < 0)
738 return RX_DROP_UNUSABLE;
739
740 if (status->flag & RX_FLAG_DECRYPTED) {
741 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
742 return RX_DROP_UNUSABLE;
743 } else {
744 if (skb_linearize(rx->skb))
745 return RX_DROP_UNUSABLE;
746 }
747
981d94a8
JB		 748 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
749 gcmp_hdr2pn(pn, skb->data + hdrlen);
00b9cfa3 750
981d94a8 751 queue = rx->security_idx;
00b9cfa3 752
981d94a8
JB		 753 if (memcmp(pn, key->u.gcmp.rx_pn[queue],
754 IEEE80211_GCMP_PN_LEN) <= 0) {
755 key->u.gcmp.replays++;
00b9cfa3 756 return RX_DROP_UNUSABLE;
981d94a8
JB		 757 }
758
759 if (!(status->flag & RX_FLAG_DECRYPTED)) {
760 u8 aad[2 * AES_BLOCK_SIZE];
761 u8 j_0[AES_BLOCK_SIZE];
762 /* hardware didn't decrypt/verify MIC */
763 gcmp_special_blocks(skb, pn, j_0, aad);
764
765 if (ieee80211_aes_gcm_decrypt(
766 key->u.gcmp.tfm, j_0, aad,
767 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
768 data_len,
769 skb->data + skb->len -
770 IEEE80211_GCMP_MIC_LEN))
771 return RX_DROP_UNUSABLE;
772 }
773
774 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
00b9cfa3
JM		 775 }
776
00b9cfa3
JM		 777 /* Remove GCMP header and MIC */
778 if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN))
779 return RX_DROP_UNUSABLE;
780 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
781 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
782
783 return RX_CONTINUE;
784}
785
2475b1cc
MS		 786static ieee80211_tx_result
787ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
788 struct sk_buff *skb)
789{
790 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
791 struct ieee80211_key *key = tx->key;
792 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2475b1cc 793 int hdrlen;
c7ef38e0 794 u8 *pos, iv_len = key->conf.iv_len;
2475b1cc
MS		 795
796 if (info->control.hw_key &&
797 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
798 /* hwaccel has no need for preallocated head room */
799 return TX_CONTINUE;
800 }
801
c7ef38e0
CI		 802 if (unlikely(skb_headroom(skb) < iv_len &&
803 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
2475b1cc
MS		 804 return TX_DROP;
805
806 hdrlen = ieee80211_hdrlen(hdr->frame_control);
807
c7ef38e0
CI		 808 pos = skb_push(skb, iv_len);
809 memmove(pos, pos + iv_len, hdrlen);
2475b1cc
MS		 810
811 return TX_CONTINUE;
812}
813
814static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
815{
816 int i;
817
818 /* pn is little endian */
819 for (i = len - 1; i >= 0; i--) {
820 if (pn1[i] < pn2[i])
821 return -1;
822 else if (pn1[i] > pn2[i])
823 return 1;
824 }
825
826 return 0;
827}
828
829static ieee80211_rx_result
830ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
831{
832 struct ieee80211_key *key = rx->key;
833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
834 const struct ieee80211_cipher_scheme *cs = NULL;
835 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
836 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
837 int data_len;
838 u8 *rx_pn;
839 u8 *skb_pn;
840 u8 qos_tid;
841
842 if (!rx->sta || !rx->sta->cipher_scheme ||
843 !(status->flag & RX_FLAG_DECRYPTED))
844 return RX_DROP_UNUSABLE;
845
846 if (!ieee80211_is_data(hdr->frame_control))
847 return RX_CONTINUE;
848
849 cs = rx->sta->cipher_scheme;
850
851 data_len = rx->skb->len - hdrlen - cs->hdr_len;
852
853 if (data_len < 0)
854 return RX_DROP_UNUSABLE;
855
856 if (ieee80211_is_data_qos(hdr->frame_control))
857 qos_tid = *ieee80211_get_qos_ctl(hdr) &
858 IEEE80211_QOS_CTL_TID_MASK;
859 else
860 qos_tid = 0;
861
862 if (skb_linearize(rx->skb))
863 return RX_DROP_UNUSABLE;
864
865 hdr = (struct ieee80211_hdr *)rx->skb->data;
866
867 rx_pn = key->u.gen.rx_pn[qos_tid];
868 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
869
870 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
871 return RX_DROP_UNUSABLE;
872
873 memcpy(rx_pn, skb_pn, cs->pn_len);
874
875 /* remove security header and MIC */
876 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
877 return RX_DROP_UNUSABLE;
878
879 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
880 skb_pull(rx->skb, cs->hdr_len);
881
882 return RX_CONTINUE;
883}
765cb46a
JM		 884
885static void bip_aad(struct sk_buff *skb, u8 *aad)
886{
33766368
JM		 887 __le16 mask_fc;
888 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
889
765cb46a
JM		 890 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
891
892 /* FC type/subtype */
765cb46a 893 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
33766368
JM		 894 mask_fc = hdr->frame_control;
895 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
896 IEEE80211_FCTL_MOREDATA);
897 put_unaligned(mask_fc, (__le16 *) &aad[0]);
765cb46a 898 /* A1 || A2 || A3 */
33766368 899 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
765cb46a
JM		 900}
901
902
75396ae6
JB		 903static inline void bip_ipn_set64(u8 *d, u64 pn)
904{
905 *d++ = pn;
906 *d++ = pn >> 8;
907 *d++ = pn >> 16;
908 *d++ = pn >> 24;
909 *d++ = pn >> 32;
910 *d = pn >> 40;
911}
912
765cb46a
JM		 913static inline void bip_ipn_swap(u8 *d, const u8 *s)
914{
915 *d++ = s[5];
916 *d++ = s[4];
917 *d++ = s[3];
918 *d++ = s[2];
919 *d++ = s[1];
920 *d = s[0];
921}
922
923
924ieee80211_tx_result
925ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
926{
252b86c4
JB		 927 struct sk_buff *skb;
928 struct ieee80211_tx_info *info;
765cb46a
JM		 929 struct ieee80211_key *key = tx->key;
930 struct ieee80211_mmie *mmie;
75396ae6
JB		 931 u8 aad[20];
932 u64 pn64;
765cb46a 933
252b86c4
JB		 934 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
935 return TX_DROP;
936
937 skb = skb_peek(&tx->skbs);
938
939 info = IEEE80211_SKB_CB(skb);
940
813d7669 941 if (info->control.hw_key)
252b86c4 942 return TX_CONTINUE;
765cb46a
JM		 943
944 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
945 return TX_DROP;
946
947 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
948 mmie->element_id = WLAN_EID_MMIE;
949 mmie->length = sizeof(*mmie) - 2;
950 mmie->key_id = cpu_to_le16(key->conf.keyidx);
951
952 /* PN = PN + 1 */
db388a56 953 pn64 = atomic64_inc_return(&key->conf.tx_pn);
765cb46a 954
75396ae6 955 bip_ipn_set64(mmie->sequence_number, pn64);
765cb46a
JM		 956
957 bip_aad(skb, aad);
958
959 /*
960 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
961 */
75396ae6
JB		 962 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
963 skb->data + 24, skb->len - 24, mmie->mic);
765cb46a
JM		 964
965 return TX_CONTINUE;
966}
967
56c52da2
JM		 968ieee80211_tx_result
969ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
970{
971 struct sk_buff *skb;
972 struct ieee80211_tx_info *info;
973 struct ieee80211_key *key = tx->key;
974 struct ieee80211_mmie_16 *mmie;
975 u8 aad[20];
976 u64 pn64;
977
978 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
979 return TX_DROP;
980
981 skb = skb_peek(&tx->skbs);
982
983 info = IEEE80211_SKB_CB(skb);
984
985 if (info->control.hw_key)
986 return TX_CONTINUE;
987
988 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
989 return TX_DROP;
990
991 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
992 mmie->element_id = WLAN_EID_MMIE;
993 mmie->length = sizeof(*mmie) - 2;
994 mmie->key_id = cpu_to_le16(key->conf.keyidx);
995
996 /* PN = PN + 1 */
db388a56 997 pn64 = atomic64_inc_return(&key->conf.tx_pn);
56c52da2
JM		 998
999 bip_ipn_set64(mmie->sequence_number, pn64);
1000
1001 bip_aad(skb, aad);
1002
1003 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1004 */
1005 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1006 skb->data + 24, skb->len - 24, mmie->mic);
1007
1008 return TX_CONTINUE;
1009}
765cb46a
JM		 1010
1011ieee80211_rx_result
1012ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1013{
1014 struct sk_buff *skb = rx->skb;
eb9fb5b8 1015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
765cb46a
JM		 1016 struct ieee80211_key *key = rx->key;
1017 struct ieee80211_mmie *mmie;
1018 u8 aad[20], mic[8], ipn[6];
1019 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1020
1021 if (!ieee80211_is_mgmt(hdr->frame_control))
1022 return RX_CONTINUE;
1023
a8286911
JB		 1024 /* management frames are already linear */
1025
765cb46a
JM		 1026 if (skb->len < 24 + sizeof(*mmie))
1027 return RX_DROP_UNUSABLE;
1028
1029 mmie = (struct ieee80211_mmie *)
1030 (skb->data + skb->len - sizeof(*mmie));
1031 if (mmie->element_id != WLAN_EID_MMIE ||
1032 mmie->length != sizeof(*mmie) - 2)
1033 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1034
1035 bip_ipn_swap(ipn, mmie->sequence_number);
1036
1037 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1038 key->u.aes_cmac.replays++;
1039 return RX_DROP_UNUSABLE;
1040 }
1041
eb9fb5b8 1042 if (!(status->flag & RX_FLAG_DECRYPTED)) {
765cb46a
JM		 1043 /* hardware didn't decrypt/verify MIC */
1044 bip_aad(skb, aad);
75396ae6 1045 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
765cb46a
JM		 1046 skb->data + 24, skb->len - 24, mic);
1047 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1048 key->u.aes_cmac.icverrors++;
1049 return RX_DROP_UNUSABLE;
1050 }
1051 }
1052
1053 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1054
1055 /* Remove MMIE */
1056 skb_trim(skb, skb->len - sizeof(*mmie));
1057
1058 return RX_CONTINUE;
1059}
d32a1028 1060
56c52da2
JM		 1061ieee80211_rx_result
1062ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1063{
1064 struct sk_buff *skb = rx->skb;
1065 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1066 struct ieee80211_key *key = rx->key;
1067 struct ieee80211_mmie_16 *mmie;
1068 u8 aad[20], mic[16], ipn[6];
1069 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1070
1071 if (!ieee80211_is_mgmt(hdr->frame_control))
1072 return RX_CONTINUE;
1073
1074 /* management frames are already linear */
1075
1076 if (skb->len < 24 + sizeof(*mmie))
1077 return RX_DROP_UNUSABLE;
1078
1079 mmie = (struct ieee80211_mmie_16 *)
1080 (skb->data + skb->len - sizeof(*mmie));
1081 if (mmie->element_id != WLAN_EID_MMIE ||
1082 mmie->length != sizeof(*mmie) - 2)
1083 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1084
1085 bip_ipn_swap(ipn, mmie->sequence_number);
1086
1087 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1088 key->u.aes_cmac.replays++;
1089 return RX_DROP_UNUSABLE;
1090 }
1091
1092 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1093 /* hardware didn't decrypt/verify MIC */
1094 bip_aad(skb, aad);
1095 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1096 skb->data + 24, skb->len - 24, mic);
1097 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1098 key->u.aes_cmac.icverrors++;
1099 return RX_DROP_UNUSABLE;
1100 }
1101 }
1102
1103 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1104
1105 /* Remove MMIE */
1106 skb_trim(skb, skb->len - sizeof(*mmie));
1107
1108 return RX_CONTINUE;
1109}
1110
8ade538b
JM		 1111ieee80211_tx_result
1112ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1113{
1114 struct sk_buff *skb;
1115 struct ieee80211_tx_info *info;
1116 struct ieee80211_key *key = tx->key;
1117 struct ieee80211_mmie_16 *mmie;
1118 struct ieee80211_hdr *hdr;
1119 u8 aad[20];
1120 u64 pn64;
1121 u8 nonce[12];
1122
1123 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1124 return TX_DROP;
1125
1126 skb = skb_peek(&tx->skbs);
1127
1128 info = IEEE80211_SKB_CB(skb);
1129
1130 if (info->control.hw_key)
1131 return TX_CONTINUE;
1132
1133 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1134 return TX_DROP;
1135
1136 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1137 mmie->element_id = WLAN_EID_MMIE;
1138 mmie->length = sizeof(*mmie) - 2;
1139 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1140
1141 /* PN = PN + 1 */
db388a56 1142 pn64 = atomic64_inc_return(&key->conf.tx_pn);
8ade538b
JM		 1143
1144 bip_ipn_set64(mmie->sequence_number, pn64);
1145
1146 bip_aad(skb, aad);
1147
1148 hdr = (struct ieee80211_hdr *)skb->data;
1149 memcpy(nonce, hdr->addr2, ETH_ALEN);
1150 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1151
1152 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1153 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1154 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1155 return TX_DROP;
1156
1157 return TX_CONTINUE;
1158}
1159
1160ieee80211_rx_result
1161ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1162{
1163 struct sk_buff *skb = rx->skb;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1165 struct ieee80211_key *key = rx->key;
1166 struct ieee80211_mmie_16 *mmie;
1167 u8 aad[20], mic[16], ipn[6], nonce[12];
1168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1169
1170 if (!ieee80211_is_mgmt(hdr->frame_control))
1171 return RX_CONTINUE;
1172
1173 /* management frames are already linear */
1174
1175 if (skb->len < 24 + sizeof(*mmie))
1176 return RX_DROP_UNUSABLE;
1177
1178 mmie = (struct ieee80211_mmie_16 *)
1179 (skb->data + skb->len - sizeof(*mmie));
1180 if (mmie->element_id != WLAN_EID_MMIE ||
1181 mmie->length != sizeof(*mmie) - 2)
1182 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1183
1184 bip_ipn_swap(ipn, mmie->sequence_number);
1185
1186 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1187 key->u.aes_gmac.replays++;
1188 return RX_DROP_UNUSABLE;
1189 }
1190
1191 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1192 /* hardware didn't decrypt/verify MIC */
1193 bip_aad(skb, aad);
1194
1195 memcpy(nonce, hdr->addr2, ETH_ALEN);
1196 memcpy(nonce + ETH_ALEN, ipn, 6);
1197
1198 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1199 skb->data + 24, skb->len - 24,
1200 mic) < 0 ||
1201 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1202 key->u.aes_gmac.icverrors++;
1203 return RX_DROP_UNUSABLE;
1204 }
1205 }
1206
1207 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1208
1209 /* Remove MMIE */
1210 skb_trim(skb, skb->len - sizeof(*mmie));
1211
1212 return RX_CONTINUE;
1213}
1214
d32a1028
YD		 1215ieee80211_tx_result
1216ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1217{
1218 struct sk_buff *skb;
1219 struct ieee80211_tx_info *info = NULL;
2475b1cc 1220 ieee80211_tx_result res;
d32a1028
YD		 1221
1222 skb_queue_walk(&tx->skbs, skb) {
1223 info = IEEE80211_SKB_CB(skb);
1224
1225 /* handle hw-only algorithm */
1226 if (!info->control.hw_key)
1227 return TX_DROP;
2475b1cc 1228
c7ef38e0 1229 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
2475b1cc
MS		 1230 res = ieee80211_crypto_cs_encrypt(tx, skb);
1231 if (res != TX_CONTINUE)
1232 return res;
1233 }
d32a1028
YD		 1234 }
1235
1236 ieee80211_tx_set_protected(tx);
1237
1238 return TX_CONTINUE;
1239}
2475b1cc
MS		 1240
1241ieee80211_rx_result
1242ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1243{
aeb136c5 1244 if (rx->sta && rx->sta->cipher_scheme)
2475b1cc
MS		 1245 return ieee80211_crypto_cs_decrypt(rx);
1246
1247 return RX_DROP_UNUSABLE;
1248}
Linux 6.x block layer and io_uring tree(s)